PL167492B1 - Equipment for recording and playing discs - Google Patents

Abstract

The disk recording appts. sequentially inputs data to a memory (14) at one transfer rate. This data is subsequently read out at a second, higher transfer rate and recorded to disk (2). The amounts of data read from the memory are set so that there is a writing space in memory. During playback, the recorded data are reproduced at a rate, higher than the rate for outputting the data, and stored in a memory (22). Again the amount of data read always maintains a minimum amount of data in the memory (22).

Description

The present invention relates to a disc recording and reproducing apparatus for successively storing incoming input data successively on a disc recording medium and obtaining successively reproduced output data from a disc recording medium.

In record devices, for example CD players intended to play compact discs, with a concentric arrangement of tracks on which digital audio signal data in the form of a sequence of pits is recorded, the track of the disc is illuminated by a laser beam, while the disc is rotated at a constant linear speed by a motor spindles. The digital data of the audio signal is reproduced by detecting changes in the intensity of the reflected light, due to the presence or absence of pits. Although the error rate of data in the CD player may be, for example, 10- ^5, the reproduced data is processed with error correction codes wykorzysującej error detection and correction. In normal use, this eliminates the problems associated with playback errors.

In a CD player equipped with an optical reproduction head, in a follow-up arrangement, e.g. focusing or tracking the track of the reproduction head, there may be deviations due to mechanical disturbances, e.g. vibration or shock, so that normal data reproduction may become difficult. In such a case, it is impossible to correct the errors even when the mentioned error detection and correction codes are used, so that there are momentary interruptions in the reproduction. In a CD player intended for use in vehicles and portable CD players, which are largely exposed to high vibrations and shocks, unlike stationary home CD players, a vibration damping mechanism has been used so far to avoid deviations in the operation of the tracking system.

In the so-called CD-I (Interactive CD) standard for simultaneous recording of video, character and audio information on a compact disc, apart from the digital acoustic signals (CD-DA) mode, six operating modes have been standardized. In the CD-DA mode, which provides a sound quality level equivalent to 16-bit PCM (Pulse Code Modulation) previously used, linear PCM modulation is used, with a sampling frequency of 44.1 kHz and quantization bit number of

167 492

16. In the A-level stereo and A-level mono operation, representing a sound quality equivalent to that of a LP, ADPCM (Adaptice Differential Pulse Code Modulation) shall be used with a sampling frequency of 37.8 kHz and bit number Quantization 8, Level B stereo operation and Level B mono operation, equivalent to FM broadcasting equivalent sound quality, shall use ADPCM modulation with a sampling rate of 37.8kHz and quantization bit number of 8. In stereo level C operation and mono operation level C representing the sound quality corresponding to AM broadcasting, ADPCM is used with 18.9 kHz sampling rate and 4 quantization bit number. '

The bit gain ratio at the A level of the stereo mode versus the CD-DA mode is 1/2. Data is recorded at intervals of two sectors. The playing time, i.e. playing one disc, is approximately 2 hours. In mono operation, at level A, the bit gain factor is 1/4. Data is recorded at intervals of four sectors. The playback time is approximately 4 hours. In mono operation, at level B, the bit gain factor is 1/8. Data is recorded at eight sector intervals. The playback time is approximately 8 hours. In stereo operation, at level C, the bit gain factor is 1/8. Data is recorded at eight sector intervals. In monophonic operation, at the C level, the bit gain factor is 1/16, and the data is recorded at sixteen sector intervals. The playback time is approximately 16 hours.

For example, in the B-level stereo operation, audio information is discretely recorded in sector blocks at intervals of four sectors starting with the first sector on the innermost track. After the audio information has been recorded on the outermost track, the recording of the audio information continues from the second sector of the inner track to the outer track. When reproducing the audio information recorded in this way, the data is not continuously played, such that for example the music is interrupted during the head skip back from the outer to the inner track.

Until now, devices designed for recording on optical discs of the type described, meeting the requirements of the aforementioned CD or CD-I standards, designed for recording on magneto-optical discs, enabling multiple writing have been used to record digital data. Also in the case of a plate recorder, the focusing or track tracking follower driving the record head may deviate due to mechanical disturbances, for example vibrations or shocks, so that the recording process may be interrupted periodically.

The apparatus according to the invention for recording and reproducing the record on a disc, which is a data recording medium, comprises a recording path of the input data on the tracks of the disc, provided with data compression means for converting data input successively, connected via a record path memory storing the transformed data, with the recording means on the disc. data read from this memory. The apparatus also comprises a track for reproducing data successively recorded on the disc tracks, provided with reading means for successively reading the recorded converted data from the disc, which are connected through a playback track memory, from which the sequentially recorded data is read successively by the reading means as reconstructed output data. with the means of data expansion read from this memory. The device is characterized by the fact that a central controller is connected to the memory of the write track, which controls the reading of data from this memory with the first amount of data read successively, when the amount of data stored in this memory exceeds the first amount of data, while keeping the space for the recorded data with a greater capacity. from the given second amount of data entered. The central controller is connected to the writing means controlling the write position on the disc with the first amount of data sequentially read from the write track memory successively and continuously written to the disc's write tracks.

Moreover, the playback track memory is connected to the central controller controlling the entry of read data into this memory, with the entry of a second amount of reproduced data, when the amount of reproduced data stored in the memory of the reproduction track is not greater than

167,492 of the first amount of data. The amount of data not smaller than the first amount of data is always stored in the memory of the playback track. Moreover, the central controller is connected to the reading means controlling the reading position on the plate. The reconstructed data written sequentially intermittently into the playback track memory is read successively from the disc recording tracks.

The central controller is a device that manages the reading from the memory of the write path of successively read data, the amount of which is not less than the minimum size of the written data block.

The central controller is a control device for stopping the reading of data from the memory of the write track due to a physical disturbance in the operation of the recording medium, which makes it impossible for the recording unit to write data, and under correct operating conditions of the recording unit, restoring the reading of data from the memory of the write track.

The central controller is a device controlling the readout from the memory of the recording track keeping the recording area with a capacity not less than the amount of data written in this memory during the inability of the recording unit to write data.

Attached to the central controller is a keypad that presets the input compression ratio.

Preferably, the disc is a plate magneto-optical medium and is provided with absolute time information corresponding to the recording position on the disc, recorded together with the data on the disc.

The central controller is a device controlling the start of an entry into the memory of the reproduction track when the amount of restored data stored in the memory is not less than the minimum size of the record data block.

The central controller is a control device for stopping the entry of the reproduced data into the memory of the reproduction track when the reproducing unit is unable to reproduce the recorded data, in particular as a result of a physical disturbance in the operation of the recording medium, and under the correct operating conditions of the recording unit, restoring the entry of the read data into the memory of the reproducing track. .

The central controller is a device controlling the entry into the memory of the reproduction track, keeping the amount of data stored in the memory not less than the amount of data coming from this memory at a time when the reproducing unit is unable to read the recorded data.

The reproduction unit is a device reproducing from the disc the absolute time information corresponding to the recording position together with the recorded data,

Attached to the central controller is an indicator block that includes a display unit of the absolute time information dependent on the absolute time information from the reproduction unit, which display unit is connected to a multiplier of the absolute time values by the ratio of the real time output reproduction to the read absolute time. .

The subject matter of the invention will be explained in an embodiment in the drawing, in which fig. 1 shows a block diagram of a recorder and reproduction device, fig. 2 - block diagram of an indicator unit of the device according to the invention, fig. 3 - data format used in a record recording and reproducing device shown. in Figs. 1, Figs. 4 (a) to 4 (f) show successive states of the controlled memory in the recording circuit of the recording and reproducing apparatus of the invention, Figs. 5 (a) to 5 (f) show successive states of the controlled memory in the circuit the reading plate writer and reproducer of Fig. 1, and Fig. 6 shows the CD-I data format.

The plate recording and reproducing device shown in Fig. 1 comprises a magneto-optical disc 2 constituting a record carrier, which is rotated at a predetermined speed by the main motor 1. Data is recorded along the recording tracks of the magneto-optical plate 2, not shown, by the action of a magnetic field modulated according to with the recorded data, with the aid of the magnetic head 4, with the illumination of the magneto-optical plate 2 with laser light from the optical head 3. The playback of the recorded data is carried out by following the recording paths of the magneto-optical plate 2 using a laser beam from the optical head 3. Optical head 3 not shown the figure contains a light source

167 492, in particular a laser diode, optical elements, in particular collimating lenses, objective elements, a polarizing light beam splitter, cylindrical lenses and a photodetector, which are suitably positioned. The optical head 3 is located opposite the magnetic head 4, so that the magneto-optical plate 2 is between these heads 3 and 4. The optical head 3 directs a beam of laser light onto a selected path of the magneto-optical plate 2, to which a magnetic field modulated according to the recorded data is supplied. When the magnetic head 4 is controlled by means of the recording track head control 16, data is recorded on the magneto-optical plate 2 by a thermomagnetic method. The optical head 3 also detects the laser light reflected from the selected path to be illuminated, in order to detect a focus error, in particular using the so-called astigmatic method, or to detect a tracking error, preferably using a so-called differential method, and generate a reproduced signal by detecting differences in the polarization angle (Kerr angle, rotation of the plane of polarization) of the laser light reflected from the tracked track during data reproduction from the magneto-optical plate 2.

The output signal from the optical head 3 is fed to the RF circuit 5. The RF circuit 5 extracts the focus error signal and the tracking error signal from the output signal of the head 3 for feeding them to the follow-up control circuit 6 and reconstructing the signal as binary encoded signals. These encoded binary signals are fed to the decoder 21 of the readout path. A follow control system 6, not shown, includes, for example, a focus control follower circuit, a tracking control circuit, a main motor follower circuit, and a tracking bridge advance control circuit. The focus control system controls the focus of the optics of the optical head 3, not shown, bringing the focus error to zero. The following tracker aligns the optics of the optical head 3, bringing the track tracking error to zero. The follower system of the main engine controls the main engine 1 so that the magneto-optical plate 2 rotates at a given rotational speed. The bridge tracker moves the bridge with the optical head 3 and magnetic head 4 to the selected path of the magneto-optical plate 2, determined by the central controller (CPU) 7. The slave control system 6, which performs these various control functions, provides the central controller 7 with information representing the conditions operation of various blocks controlled by this sequential control system 6. Thus, the optical head 3 together with the magnetic head 4 constitute both the recording unit and the reproduction unit of the apparatus. The central controller 7 is connected to the key input manipulator block 8 and the indicator block 9. The central controller 7 switches the write and read paths into the appropriate operating mode (compression mode) determined by the information from the manipulator input, coming from the key input manipulator block 8. Central controller 7 determines the write position and the read position on the record track tracked by the optical head 3 and magnetic head 4, respectively, on the basis of the address information of the sector block reproduced from the record track of the magneto-optical disc 2 via time-related header data and so-called sub data -Q date. The central controller 7 supplies the pointer block 9 with the absolute time data Dtm corresponding to the write position and the read position, data Dcomp relating to the compression ratio depending on the operating mode of the write track and the read track, and data relating to the relative offset Doffset to the indicating device such that the indicator block 9 displays the write time and the read time.

The indicator block 9 shown in Fig. 2 is provided with a subtractor 34 to which absolute time data Dtm are fed via the first register 31 and the relative offset data Doffset via the second register 33. The multiplier 35 is also included. to which the compression ratio Dcomp data is fed from central controller 7 via the third register 32, and the Dadd output from subtractor 34. The output Dmult of the multiplier 35 is given to the index 36. Subtractor 34 subtracts the Doffset data relating to the relative offset temporarily stored in the second register 33 from the absolute time data Dtm which is temporarily stored in the first register 31. Thus, subtractor 34 subtracts the relative offset Doffset data from this absolute time data Dtm. which represent the current zap position isu i

167 492 the read position on the write and replay tracks, respectively, according to the address information of a sector block to produce differential output, Dadd (- Dt-Doffset). The Dadd data represents absolute time only for the program data that is currently being written or read and fed to the multiplier 35. The multiplier 35 multiplies the compression ratio data Dcomp, which is temporarily stored in the third register 32, by the differential output data Dadd. from subtractor 34. Thus, the multiplication block 35 produces a multiplication result Dmult that represents the real time of the program data currently being written or read, and feeds this result Dmult to pointer 36. Thus pointer 36 displays the time relating to the program data currently being written or read, only based on the output of the Dmult multiplication. Although, in the above-mentioned embodiment, the real time is displayed from the programming data only, the total time period to the current time can be displayed by taking the Doffset value. The Doffset information is derived from the data from the Table-off-Contents: TOC that was previously saved on the disc. The indicator 36 is also connected to the time base block 37, which is used to interpolate the time to be displayed on the indicator in the case when the compression ratio of the read or write path is large, or when it is necessary to display the time in small units.

The recording path of the plate recording and reproducing device comprises an analog-to-digital converter 12, to which an analog audio signal Ain from the input terminal 10 is fed via a low-pass filter 11. The analog-to-digital converter 12 quantizes the audio signal Ain, giving digital data of the audio signal with a given value. a transmission rate (75 sectors per second) corresponding to the CD-DA mode of operation in the aforementioned CD-I standard. The digital tapping data obtained in the analog-to-digital converter 12 is fed to the ADPCM encoder 13, which is the data compression means. The ADPCM 13 encoder performs, in accordance with the various modes of the aforementioned CD-I standard, the compression of this digital audio data with a given bit rate, which is achieved by quantizing the Ain audio signal in an analog-to-digital converter 12. The mode of operation is determined by the central controller 7. In this variant in the embodiment, it is assumed that the digital audio signal of the CD-DA mode is converted into a digital audio signal ADPCM of the stereo B level, with a transmission rate of 18.75 (75 // 4) sectors per second with the compression of the timeline to 1/4, in ADPCM encoder 13. ADPCM audio data of the B-level stereo mode, which are successively sent out with a transmission rate of 18/75 sectors per second, from the ADPCM encoder 13, are fed to the memory track 14.

Writing and reading of data to the record track 14 memory, and from the memory, takes place under the control of the central controller 7. The ADPCM audio data of the stereo mode, level B, which come out of the ADPCM 13 encoder, are sequentially stored in the memory of the record track 14 with a transmission speed of 18.75 sectors per second and then are read in series from the memory of the write path 14 at a transmission rate of 75 sectors per second as write data. The central controller 7 successively writes the ADPCM audio data to the recorder memory 14 at a baud rate of 18.75 sectors per second, with successively increasing the value of the write index In record path memory 14 at a baud rate of 18.75 sectors per second, such as shown in Figs. 4 (a) - 4 (b). Then, as shown in Figs. 4 (c) - 4 (d) and Figs. 4 (e) - 4 (f), the central controller 7 reads from the memory of the write path 14 a number of K recorded data in the form of a series, for example, with a bitrate of 75 sectors per second as write data while increasing the read rate R of recorder memory 14 from 75 sectors per second if the amount of ADPCM audio data stored in recorder memory 14 exceeds a predetermined value K. ADPCM audio, that is, write data that has been read in series at a transmission rate of 75 sectors per second, from the record path 14 memory is fed to encoder 15. The encoder 15 performs encoding processing, more specifically EFM encoding processing, of the input data in series from record track 14, ensuring error correction. The recorded data encoded in the encoder 15 are fed to the magnetic head control system 16. The head control system 16

167 492 of the magnetic head 4 is connected to this magnetic head 4 in order to control it so that the magnetic field acting on the magneto-optical plate 2 is modulated according to the recorded data.

The central controller 7 performs the above-mentioned memory control of the recording track 14 and determines the write position on the track, such that the write data which has been read from this memory 14 in series with this memory controller are successively written to the recording tracks of the magneto-optical disc 2 as this is shown in Fig. 3. The central controller 7 monitors the last position of the data recorded on the recording tracks of the magneto-optical disc 2 and provides a follow control system 6 with a control signal designating the write position based on the position of the last recorded data. In the recording path of the recorder and reproducing apparatus, the ADPCM audio data output at a rate of 18.75 sectors per second from the ADPCM encoder 13 is stored in the memory of the record track 14 at a transmission rate of 18.75 sectors per second, with the mentioned memory control by the central controller 7 When the amount of ADPCM audio data stored in the memory of recorder 14 exceeds a predetermined value of K, the ADPCM audio data is read from this memory 14 in series with a transmission rate of 75 sectors per second as record data. Preferably, this amount of data is not less than the minimum data block written. Thus, the input data can be written successively to this memory 14 while providing the memory path 14 with space for data, with a capacity always greater than a given amount of data. The recorded data, which is read from the memory in series, can be written to the recording tracks of the magneto-optical plate 2 successively, with the determination of the recording position in the track of the magneto-optical plate 2 by the central controller 7.

As mentioned, the data area recorded in the memory of the recording track 14 has a capacity always greater than the assumed capacity. Accordingly, if there is a break in writing data to the magneto-optical disc, as a result of the head skipping from track to track, or as a result of disturbances detected by the central controller 7, it is possible to take measures to continue the recording while maintaining the continuity of writing data to the memory. if the area to be recorded has a capacity greater than a predetermined value, then the input data can be written to the track of the recording magneto-optical disc 2 continuously. For each ADPCM audio data sector, time-related header data (absolute time information) corresponding to the physical sector address is added and stored on the magneto-optical plate 2. In a predetermined area of the magneto-optical plate for a table of contents (TOC), the table of contents (TOC) data representing the area and recording mode is stored.

The reproduction path of a plate recording and reproducing apparatus will be described below. In the reproduction track, data is read which has been successively recorded on the recording track of the magneto-optical disc 2 by said recording track. The reproduction path includes a decoder 21 to which the read output signals obtained by following the track of the magneto-optical recording disc 2 are fed by means of laser light generated by the optical head 3, and binary encoded in the RF system 5. The decoder of the reproduction path 21 corresponds to the recording path encoder 15 and performs signal processing, e.g., error correction decoding, and EFM decoding of the reconstructed binary-encoded RF outputs 5. The decoder output 21 is the ADPCM audio data of said B-level stereo mode, at a transmission rate of 75 sectors per second, which is greater than the normal bit rate in stereo level B mode. The reproduced data received from the decoder 21 is fed to the memory of the reproduction path 22.

The recording and reading of data to and from the memory of the reproduction path 22 takes place under the control of the central controller 7, so that the reproduced data delivered at the speed of 75 sectors per second from the decoder 21 is written to the memory of the reproduction path 22 in series with the transmission speed of 75 sectors per second. second and are read sequentially from this memory 22 at the normal transmission rate of 18.75 sectors per second, corresponding to the stereo level B mode. The central controller 7 writes the reproduced data to the memory of the reproduction path 22 at a speed of 75 sectors per second, simultaneously increasing the value of the index W of the record of this memory 22 and successively reads the reconstructed data at a baud rate of 18.75 sectors per second from this

167,492 of the memory 22 while increasing the reading ratio R of the memory 22 at a transmission rate of 18.75 sectors per second. As shown in Figs. 5 (a) - 5 (b), the central controller 7 manages the memory as the memory write index of the reproducing track 22 is incremented by writing bursts at 75 sectors per second, and causes the recording to stop if the writing index W catches up with index R. (Fig. 5 (c)), and starts recording when the amount of retrieved data stored in memory 22 exceeds the predetermined value L (Figs. 5 (b) - 5 (e)). Preferably, this predetermined amount of data is not less than the minimum record data block. The central controller 7 not only manages the memory in the manner described, but also determines the read position on the recording track such that the reproduced data, successively written in the memory of the reproduction track 22 by the controller, is successively read from the recording track of the magneto-optical disc. The central controller 7 monitors the last position of the reproduced data on the recording tracks of the magneto-optical disc 2, and provides the following control system 6 with a control signal which determines a reproduction position corresponding to the position of the last reproduced data.

The ADPCM audio data of the B level stereo mode as reconstructed data read from the memory of playback path 22 at a bit rate of 18.75 sectors per second is fed to the ADPCM decoder 23, which is the data expansion means. The ADPCM decoder 23 corresponds to the ADPCM encoder 13 of the recorder. The operating mode of the ADPCM decoder 23 is determined by the central controller 7. In the embodiment of the invention, the decoder 23 reproduces the digital audio signal with fourfold expansion of the ADPCM audio data of the stereo level B mode. The digital audio signal is fed to the digital to analog converter 24 from the ADPCM decoder 23. The DAC 24 converts the digital audio signal supplied from the ADPCM decoder 23 to analog audio signals Αουτ, and passes them to output terminal 26 via a low-pass filter 25. Digital audio signals Dout from the ADPCM decoder 23 are output to digital output terminal 28, via via digital output encoder 27.

In the reproduction path of a plate recorder and reproducer, the ADPCM audio data of the stereo mode, level B, played back from the record track of the magneto-optical disc 2, is stored in series in the memory of the playback path 22 at a transmission rate of 75 sectors per second, and the ADPCM audio data is successively read from memory as data reproduced at 18.75 sectors per second in memory management by the central controller 7. Accordingly, playback data can be read from the memory of the playback track 22, so that an area is always provided in that memory 22 for reading data, with a capacity greater than the set value L.

The reproduced data, which is read from the memory in series, can be played back from the record track of the magneto-optical disc 2 successively, by determining the reading position in the track of the magneto-optical disc 2 by the central controller 7. As already mentioned, the area intended for reading data in the memory of the record track 14 has a capacity always greater than the set value L, it is possible to continuously output the analog signal by reading data from the read data area with a capacity greater than L, and during this time the process of resuming work can be carried out, even if there is a break in reading data from the magneto-optical plate 2, as a result of the head jumping from track to track, or as a result of a disturbance detected by the central controller 7.

The reproduction path indicator block 9 shapes the additional output Dadd (= Dtm - Doffset). A given Dadd represents the absolute time period from the beginning, determined solely on the basis of data contained in the currently written or read program, and is a given Dtm referring to absolute time, corresponding to the current write or read position, respectively of the write or playback path, depending on the address information in sector block, reported from the central controller 7, as described. Index block 9 shapes the output Dmult from the multiplier that represents the actual elapsed time derived from the program data currently being written or played by multiplying the output value Dadd by the given Dcomp relating to the compression ratio, i.e. by a factor of 4 in the case of level B stereo mode. So, based on the result of the multiplication of the multiplication output Dmult, it is possible to display the actual

167 492 elapsed time based solely on current program data being written or read. Although an embodiment of a plate recorder and reproducer has been described with reference to recording and reading ADPCM audio data in level B stereo mode, it is possible to record and play ADPCM audio in a different mode and in accordance with a different CD-I standard. In order to record the data, it is sufficient to compress the timeline of the processed audio PCM data of the CD-DA mode in the memory of the reproduction path 22 while providing the magneto-optical disc drive 2, with a rotational speed dependent on the ratio of the compression of the timeline in the record path and the expansion of the timeline in the memory 22 of the reproduction path.

In the recording path of the disc recording and reproducing apparatus according to the invention, the input data for successive input is stored sequentially in memory. When the amount of input data stored in the memory exceeds a predetermined value, the stored input data is sequentially read from the memory as written data in series at a rate higher than the input data rate. Accordingly, the input data can be written successively into memory such that a data storage space is always provided in the memory of a size greater than a predetermined value. The recording data read from the memory in series are written to the recording tracks successively, with the control of the write position on the recording tracks of the disc recording medium.

As mentioned, the data area recorded in the memory always has a capacity greater than a predetermined value. Then the input data can be recorded continuously on the track of the magnetic recording medium even if there is a break in data recording on the magneto-optical disc, due to the head jump from track to track, or due to disturbances. Moreover, it is possible to take actions aimed at restoring the continuity of the recording during this interruption. The input data can thus be recorded successively on the recording track of the disc recording medium. The solution according to the invention provides a plate recording device which is suitable for successively recording data on tracks of a plate recording medium, irrespective of deviations in the operation of the following system caused by external disturbances. In the reproduction path of the recording and reproducing apparatus, data recorded on a record carrier rotating at a predetermined speed is reproduced sequentially at a speed greater than a predetermined speed at which the data is outputted. This write data is read by the read means and is sequentially written to the memory at a faster baud rate, and then successively read from the memory as reconstructed output at a predetermined, lower baud rate. The reconstructed output data can thus be read successively from the memory, so that there will always be space in the memory for read data with a capacity greater than a predetermined value. The reconstructed data that has been stored in the memory in series is restored from the recording tracks successively, with the control of the read position from the tracks of the disc recording medium. Since the data area read in the memory has a capacity always greater than the set value, the reading of data from the memory can take place continuously, even if there is an interruption in the playback of data from the record carrier, as a result of a head jump from track to track, or as a result of external interference . Moreover, during this break, it is possible to take measures to continue the work and the input of acoustic signals can be done successively.

Thus, the reproduction path of the apparatus according to the invention provides for the successive reproduction of data from the tracks of the record carrier, regardless of deviations in the operation of the following circuit caused by external disturbances.

FIG. 2

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FIG.5

SYSTEM SOUND QUALITY LEVEL 16 SECTORS TIME PLAYBACK c D 1 ADPCM LEVEL A STEREO 0D0CJ0CIBCI0D0CI0C10D 2 HOURS ADPCM LEVEL A MONO BDDnaaDDEaDDBDDD 4 HOURS ADPCM LEVEL B STEREO □□□□□□□□□□□□ anan 4 HOURS C. D and R 0 M. X AND ADPCM LEVEL B MONO 8 HOURS ADPCM LEVEL C STEREO 8 HOURS ADPCM LEVEL C MONO □□□□□□□□□□□□□□□□ 16 HOURS PCM CD-DA 0000000000000000 62 75 min.

CD-I FORMAT

FIG. 6

FIG.1

Publishing Department of the UP RP. Circulation of 90 copies. Price PLN 1.50

Claims (12)

Patent claims 1.A recording and reproducing apparatus for recording and reproducing a record on a disk, which is a data record carrier, the apparatus having an input data recording path on the disc tracks, having data compression means for converting data input successively, connected by a record path memory storing the transformed data with the recording means on the disc. on the disc, the data read from this memory, and includes a track reproducing data successively recorded on the tracks of the disc, equipped with reading means of successively reading the written converted data from the disc, which are connected through the memory of the playback track, from which the sequentially written data is read successively by the reading means as reconstructed output data, with data expansion means read from this memory, characterized in that a central controller (7) is connected to the memory of the write path (14), controlling the reading of data from this memory (14) with the first amount of data read successively, when the amount of data stored in the memory (14) exceeds this first amount of data (K), with space for recorded data with a capacity greater than the predetermined second amount of data input, the central controller (7) being connected to the recording means (15, 16) by controlling the write position on the disc (2), with the first amount of data sequentially read from the memory of the recording track (14) and successively and continuously recorded on the recording tracks of the disc (2), moreover, the playback track memory (22) is connected to the central controller (7) the control to write the read data to this memory (22) with the entry of the second amount of restored data, when the amount of restored data (L) stored in the memory of the reproduction path (22) is not greater than the first amount of data, the amount of stored in this memory (22) always the amount of data is not less than the first amount of data, moreover, the central controller (7) is connected to the reading means (3,5,21) controlling with this read position on the disc (2), and the reproduced data written sequentially intermittently into the memory of the reproduction path (22) is read successively from the record tracks of the disc (2). 2. Urąądzeme wedhig claim. 1, known in the fact that the central controller 77 is the device managing the reading from the memory of the write path (14) of successively read data, the amount of which is not less than the minimum block size of written data. 3. U ^ den ^ e according to zatUz i 2 i ntienienne y ^ m, that sten ^^ mUc ζη ^ ηγ 7) i Żesi with a control device that stops reading data from the memory of the write track (14) as a result of a physical disturbance in the operation of the medium recording that prevents the recording of data by the recording unit (3,4), and in the correct operating conditions of this recording unit (3,4), restoring the reading of data from the memory of the recording track (14). 4. The device according to claim 3, characterized in that the central controller (7) is a device controlling the reading from the memory of the recording track (14) with the preservation of the recording area with a capacity not less than the amount of data stored in this memory (14) during the inability of the recording unit (3, 4) for saving data. 5. Wedhig zasizz device. A keypad as claimed in claim 1, characterized in that a key manipulator block (8) is connected to the cognitive controller (7) to preset the input compression ratio. 6. I uradzimi e wdZtog zsstrz. 1, eae ^ πnene ymn, that f ^ yy ^ ta (2) test with the use of magneto-optical oenics. 7. υ ^ Ζζ6ηίε wedhig zasizz. 1 e characteristic y ^ m that asks 21) with information about the absolute time, corresponding to the recording position on the disc (2), recorded along with the data on this disc (2). 8. Rage of wedhig zatu. . The method according to claim 1, characterized by the control of the start of an entry into the memory of the playing track (22), when the number of 167 492 3 of the data stored in this memory (22) is not less than the minimum size of a write data block. 9. Device according to claims 8. The device as claimed in claim 8, characterized in that the central controller (7) is a control device for stopping the entry of the retrieved data into the memory of the reproduction path (22) when the reproducing unit (3, 4) is unable to reproduce the recorded data, in particular due to a physical disturbance in the operation of the medium. of recording, and in the correct operating conditions of this recording unit (3,4) restoring the entry of the read data to the memory of the reproduction path (22). 10. The device according to claim 1 9. The device as claimed in claim 9, characterized in that the central controller (7) is a device controlling the entry into the memory of the reproduction path (22) with the retention of the amount of data stored in the memory (22) not less than the amount of data coming out of the memory (22) while the unit the player (3, 4) is unable to read the recorded data. 11. Office wedhig zasLz. 10, significant and ¹¹ , that the ^^^ I ^ ctt reproduced (3, -4) is a device reproducing from the disc (2) the absolute time information corresponding to the recording position together with the recorded data. 12. The device according to claim 1 The apparatus of claim 10, characterized in that an indicator block (9) is connected to the central controller (7) which includes a display unit (36) of the time information dependent on the absolute time information from the reproduction unit (3, 4), which is the display (36) is connected to a multiplier (35) of absolute time values by the ratio of the real time of reproducing the output data to the read absolute time.